Means for insulating electrical machines.



W. A. DICK, MEANS FOR INSULATING ELEGTRIGAL MACHINBS.

APFLIOATION FILED FEB. 3, 1910. I

' Patented Dec. 10, 1912.

\NVENTOR and State of Pennsylvania,

--:c1rcu1nferentialrecess 8 in 50. boss 8 .Foldedaroun the ring 9,'and se-' WILLIAM A. DICK, OF. PITTSBURGH,

PENNSYLVANIA, ASSIGNOR TO WESTINGHOUSE Specification of Letters Patent.

MEANS FOR INSULATING E'I ECTRICAL MACHINES.

Patented Dec. 10,12512.

Application filed February 3, 1910. Serial No. 541,865.

To all whom, it may concern. I

Be it known that I, WILLIAM A. DICK, a citizen of the United States, and a resident of Pittsburgh, in the count of'Allegheny ave invented a new and .useful Improvement in Means for Insulating Electrical Machines, of which the following is a specification. v

My invention relates to the insulation of electrical machines, and it has for its object to provide simple and effective means for securing insulation to the clamping rings of the commutators of dynamo-electric ma-- chines, or to similar ring-shaped members;

Figure 1 of the accompanying drawing isa longitudinal, sectional view of a part of the commutator of adynamo-electric machine that embodies my invention, and Fig. 2 is a-side view of a art of theclamping ring that is employed in the structure of Fig.1 for-securing the insulation in position.

4 The invention is shown as applied to the commutator of a d namo-electric machine, the segments 1 ofwliich are secured in posimeans of a clamping ring 3 having a V- shaped annular end face which engages inwardly extending dove-tail projecting portions ofthe segments 1, suitable insulation being interposed between the segments and the ring. .The ring 3 is-forced into engagement with the dove-tail portions of the,com-' mutator segments by means of tap bolts 5 that project through and are screwed into a rm 6. The ring 6 is mounted upon the she I. or spider 2 within an' annular recess that is provided between the outer end portion of the clamping ring 3 and the said spider, and it is seated'against aretaining r ng 7, that prevents longitudinal movement thereof with respect to the spider when pressure is applied to the clamping ring 3 by means'oft ebolts 5. I f The commutator clamping ring 3 is provided, near its outer en with an internal which'a clamping rin 9 (Fig. 2') is located', theringl9 being 'pr'e erabl composed of. steel, bronze, or other resilient material, and being 10 to permit of its read insertion m-the re,-

cured thereby at its folded portion in the recess 8, are sheets ll'of any suitable insul'aglng' fabric onmetefid extend from.

tlon upon a cylindrical shell or spider 2 by member.

member having split at the said ring an the ring 9 over the inner, the end and the outer surfaces of the ring 3 and are secured to t-l1e outer circumferential surface of the said rlng by means of a helical wire band 12, or by any other suitable means, the band 12 being covered by tape 13 or other suitable lnsulating material.

In applying the insulation to the ring 3, the desired number of sheetsof insulating materialare folded about the ring 9, which is then inserted in the internal circumferential recess 8. The insulating sheets are next drawn tightly over the surfaces of the ring 3, and their ends are secured, by means of the band 12, to the outer circumferential surface of the ring 3. The insulating covering '13 for the band 12 is finally applied. The effect of centrifugal force upon the ring 9 is simply to increase its pressure against the ring 3, and to cause it to more securely retain the lnsulat ng material 11 in place.

Of course, the invention is not limited intators but may be applied .wherever it is found desirable to insulate cylindrical shells or ring-shaped members.

'I claim as my invention:

its application to the insulation of commuv 1. The combination with a ring-shaped member having an internal circumferential recess, of a clamping ring seated in the said recess, and insulating material folded around the said ring and,secured at its ends to the outer circumferential surface of the said 2. The combination with a ring-shaped w an internal circumferential recess,'of a split clamping ring seated in the said recess, and insulating material folded around the said ring and secured at its ends 3 to the outer circumferential surface of the said member.

3. The combination with a ring-shaped member having an internal circumferential recess, of a clamping ring seated in the said .recess and an insulating fabric clamped in thesaid recess by the said ring.

- 4. The combination with a ring-shaped member haying an internal circumferential recess, of a clamping ring seated in'the said recess, insulatin g the said member, and means material clamped between for securing the insulatin material to the outer circumferential sur ace of the said 7 member,

5. The combination with a recessed melnsubscribed my name this 26th day of J an, ber to be covered by inlsulating materiaL-oi 1910. r a clamping-fin seate in a. recess in sai member, and an insulating covering fabric v WILIJAM K 5 surrounding the ring and clamped in said Witnesses:

recess thereby. BARRY H. JONES,

In testimony whereof, I have hereunto B. B. Hmns.

Copies of this natent may be obtained for five gents each, by addressing the Commissioner of Yatcnts,

V Washington, D. 0. 

